Loss = 96.6 + 10log(d-squared) + 10log(f-squared) dB
d = distance in miles
f = frequency in gigahertzSo if you know your EIRP (transmit power + antenna gain) you can estimate the signal strength at "d" distance.
-Rob
PS: I got the equation from the cisco press book "deploying license-free wireless wide-area networks" - a good generic resource (not cisco specific)
At 12:36 PM 1/5/2004 -0800, you wrote:
I know this question is very vague, but still I wonder if there is an answer to it.
Is there a theoretical formula that links antenna dB gain with increase in maximum range of the wireless signal. I understand that in theory RF signal range is infinity, but I can not figure out if there is a correlation between antenna dB gain and signal range at certain frequency. Following the common logic it is obvious that range will increase as antenna has better dB gain, but how much?
A formula for electric field goes something like: E=9500*power/distance (I might be wrong about this), but this does not take in account the frequency of our signal.
P.S. I am not concerned with terrain configuration, weather condition, and other factors at this time.
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